McDougall, Ian; van der Lingen, Gerrit J (1974): Age determination of the rhyolites of the Lord Howe Rise in the Southwest Pacific Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.708429, Supplement to: McDougall, I; van der Lingen, GJ (1974): Age of the Rhyolites of the Lord Howe Rise and the evolution of the Southwest Pacific Ocean. Earth and Planetary Science Letters, 21(2), 117-126, https://doi.org/10.1016/0012-821X(74)90044-2
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Abstract:
Drilling at site 207 (DSDP Leg 21), located on the broad summit of the Lord Howe Rise, bottomed in rhyolitic rocks. Sanidine concentrates from four samples of the rhyolite were dated by the 40Ar/39Ar total fusion method and conventional K-Ar method, and yielded concordant ages of 93.7 +/- 1.1 my, equivalent to the early part of the Upper Cretaceous. At this time the Lord Howe Rise, which has continental-type structure, is thought to have been emergent and adjacent to the eastern margin of the Australian-antarctic continent. Subsequent to 94 my ago and prior to deposition of Maastrichtian (70-65 myBP) marine sediments on top of the rhyolitic basement of the Lord Howe Rise, rifting occurred and the formation of the Tasman Basin began by sea-floor spreading with rotation of the Rise away from the margin of Australia. Subsidence of the Rise continued until Early Eocene (about 50 myBP), probably marking the end of sea-floor spreading in the Tasman Basin. These large scale movements relate to the breakup of this part of Gondwanaland in the Upper Cretaceous.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: -36.962500 * Longitude: 165.434300
Date/Time Start: 1971-12-12T00:00:00 * Date/Time End: 1971-12-12T00:00:00
Event(s):
21-207A * Latitude: -36.962500 * Longitude: 165.434300 * Date/Time: 1971-12-12T00:00:00 * Elevation: -1389.0 m * Penetration: 513 m * Recovery: 212.3 m * Location: South Pacific/Tasman Sea/CONT RISE * Campaign: Leg21 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 405 m cored; 45 m drilled; 52.4 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- McDougall, I; van der Lingen, GJ (1974): (Table 2) Total fusion 40Ar/39Ar ages on sanidine concentrates from rhyolites of DSDP Hole 21-207A. https://doi.org/10.1594/PANGAEA.708427
- McDougall, I; van der Lingen, GJ (1974): (Table 1) Major element concentrations of whole rock samples of the Lord Howe Rise rhyolites as DSDP Hole 21-207A. https://doi.org/10.1594/PANGAEA.708582
- McDougall, I; van der Lingen, GJ (1974): (Table 3) K-Ar ages on sanidine concentrates from rhyolites of DSDP Hole 21-207A. https://doi.org/10.1594/PANGAEA.708428